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Hach Differential pH and ORP Sensors

These combination sensors are designed for specialty applications for immersion or in-line mounting

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Hach Digital pHD sc sensors are available in convertible (PEEK® or Ryton®), insertion, and sanitary body styles. Three electrodes are used in these sensors to increase measurement accuracy and eliminate sensor ground loops.

This field-proven technique uses three electrodes instead of the two normally used in conventional pH sensors. Process and reference electrodes measure the pH differentially with respect to a third ground electrode. The end result is unsurpassed measurement accuracy, reduced reference junction potential, and elimination of sensor ground loops. These sensors provide greater reliability, resulting in less downtime and maintenance.


  • Drinking Water
  • Industrial water
  • Patented Technology
  • Differential electrode measurement technique
  • Patented technology
  • Replaceable salt bridge/protector
  • Built in encapsulated preamp
  • Durable body materials Versatile mounting styles
  • Differential sensor warranty

HACH diff pH ORP Brochure

Buffer solution pH 7, SKU – 2283549

Buffer solution pH 4, SKU – 2283449

Buffer solution pH 10, SKU – 2283649

Hach PHD Sensor salt bridge Ryton, SKU – SB-R1SV

Hach PHD sensor salt bridge Peek, SKU – SB-P1SV

Standard sell solution PHD sensor, SKU – 25M1A1025-115




PD1R1, PD1P1, DPD1R1, DPD1P1, RD1R5, RD1P5, DRD1R5, DRD1P5

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Estimated Delivery Time

Nationwide up to 5 business days but can varying depending on weather events and courier capacity.


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